cnn reports both bombs were small suggest they were crude devices with no sooid signs of high-grade explosive material. at this point no suspects have been arrested but police say many people have been questioned. our jana was anchoring the ktvu news when those boems went off. she's been monitoring the feeds and now joins us. >> the fbi just announced this hour it is taking the lead in this investigation. they are not confirming, though, whether there is a person of interest being questioned, which has been reported by several news organization today. also new, we have learned that some boston-area doctors say that they have pulled shrapnel and ball bearings out of some of the victims who were caught in this terrible attack. >> two blasts turned the boston marathon's finish line into a scene of chaos and panic. the bombs about 550 feet and seconds apart near a line of international flags were so powerful they shattered nearby windows and knocked nearby spectators and runners off their feet. witnesses saw people on the ground crying for help, many who lost limbs. >> it was horrible. the scene